[all-commits] [llvm/llvm-project] 25e433: [RISCV] Lower shuffle which splats a single span (...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 25e43334a86804c77d460493e37b57274257461a
      https://github.com/llvm/llvm-project/commit/25e43334a86804c77d460493e37b57274257461a
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2025-02-14 (Fri, 14 Feb 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-int-shuffles.ll

  Log Message:
  -----------
  [RISCV] Lower shuffle which splats a single span (without exact VLEN) (#127108)

If we have a shuffle which repeats the same pattern of elements, all of
which come from the first register in the source register group, we can
lower this to a single vrgather at m1 to perform the element
rearrangement, and reuse that for each register in the result vector
register group.



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